39 lines
1.2 KiB
Rust
39 lines
1.2 KiB
Rust
|
use super::utils::can_be_expressed_as_pointer_cast;
|
||
|
|
use super::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS;
|
||
|
|
use crate::utils::{span_lint_and_then, sugg};
|
||
|
|
use rustc_errors::Applicability;
|
||
|
|
use rustc_hir::Expr;
|
||
|
|
use rustc_lint::LateContext;
|
||
|
|
use rustc_middle::ty::Ty;
|
||
|
|
|
||
|
|
/// Checks for `transmutes_expressible_as_ptr_casts` lint.
|
||
|
|
/// Returns `true` if it's triggered, otherwise returns `false`.
|
||
|
|
pub(super) fn check<'tcx>(
|
||
|
|
cx: &LateContext<'tcx>,
|
||
|
|
e: &'tcx Expr<'_>,
|
||
|
|
from_ty: Ty<'tcx>,
|
||
|
|
to_ty: Ty<'tcx>,
|
||
|
|
args: &'tcx [Expr<'_>],
|
||
|
|
) -> bool {
|
||
|
|
if can_be_expressed_as_pointer_cast(cx, e, from_ty, to_ty) {
|
||
|
|
span_lint_and_then(
|
||
|
|
cx,
|
||
|
|
TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS,
|
||
|
|
e.span,
|
||
|
|
&format!(
|
||
|
|
"transmute from `{}` to `{}` which could be expressed as a pointer cast instead",
|
||
|
|
from_ty, to_ty
|
||
|
|
),
|
||
|
|
|diag| {
|
||
|
|
if let Some(arg) = sugg::Sugg::hir_opt(cx, &args[0]) {
|
||
|
|
let sugg = arg.as_ty(&to_ty.to_string()).to_string();
|
||
|
|
diag.span_suggestion(e.span, "try", sugg, Applicability::MachineApplicable);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
);
|
||
|
|
true
|
||
|
|
} else {
|
||
|
|
false
|
||
|
|
}
|
||
|
|
}
|